1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 2002 Poul-Henning Kamp 5 * Copyright (c) 2002 Networks Associates Technology, Inc. 6 * All rights reserved. 7 * 8 * This software was developed for the FreeBSD Project by Poul-Henning Kamp 9 * and NAI Labs, the Security Research Division of Network Associates, Inc. 10 * under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the 11 * DARPA CHATS research program. 12 * 13 * Redistribution and use in source and binary forms, with or without 14 * modification, are permitted provided that the following conditions 15 * are met: 16 * 1. Redistributions of source code must retain the above copyright 17 * notice, this list of conditions and the following disclaimer. 18 * 2. Redistributions in binary form must reproduce the above copyright 19 * notice, this list of conditions and the following disclaimer in the 20 * documentation and/or other materials provided with the distribution. 21 * 3. The names of the authors may not be used to endorse or promote 22 * products derived from this software without specific prior written 23 * permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 28 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 35 * SUCH DAMAGE. 36 */ 37 38 #include <sys/cdefs.h> 39 __FBSDID("$FreeBSD$"); 40 41 #include <sys/param.h> 42 #include <sys/systm.h> 43 #include <sys/malloc.h> 44 #include <sys/kernel.h> 45 #include <sys/conf.h> 46 #include <sys/ctype.h> 47 #include <sys/bio.h> 48 #include <sys/bus.h> 49 #include <sys/lock.h> 50 #include <sys/mutex.h> 51 #include <sys/proc.h> 52 #include <sys/errno.h> 53 #include <sys/time.h> 54 #include <sys/disk.h> 55 #include <sys/fcntl.h> 56 #include <sys/limits.h> 57 #include <sys/sysctl.h> 58 #include <geom/geom.h> 59 #include <geom/geom_int.h> 60 #include <machine/stdarg.h> 61 62 struct g_dev_softc { 63 struct mtx sc_mtx; 64 struct cdev *sc_dev; 65 struct cdev *sc_alias; 66 int sc_open; 67 u_int sc_active; 68 #define SC_A_DESTROY (1 << 31) 69 #define SC_A_OPEN (1 << 30) 70 #define SC_A_ACTIVE (SC_A_OPEN - 1) 71 }; 72 73 static d_open_t g_dev_open; 74 static d_close_t g_dev_close; 75 static d_strategy_t g_dev_strategy; 76 static d_ioctl_t g_dev_ioctl; 77 78 static struct cdevsw g_dev_cdevsw = { 79 .d_version = D_VERSION, 80 .d_open = g_dev_open, 81 .d_close = g_dev_close, 82 .d_read = physread, 83 .d_write = physwrite, 84 .d_ioctl = g_dev_ioctl, 85 .d_strategy = g_dev_strategy, 86 .d_name = "g_dev", 87 .d_flags = D_DISK | D_TRACKCLOSE, 88 }; 89 90 static g_init_t g_dev_init; 91 static g_fini_t g_dev_fini; 92 static g_taste_t g_dev_taste; 93 static g_orphan_t g_dev_orphan; 94 static g_attrchanged_t g_dev_attrchanged; 95 static g_resize_t g_dev_resize; 96 97 static struct g_class g_dev_class = { 98 .name = "DEV", 99 .version = G_VERSION, 100 .init = g_dev_init, 101 .fini = g_dev_fini, 102 .taste = g_dev_taste, 103 .orphan = g_dev_orphan, 104 .attrchanged = g_dev_attrchanged, 105 .resize = g_dev_resize 106 }; 107 108 /* 109 * We target 262144 (8 x 32768) sectors by default as this significantly 110 * increases the throughput on commonly used SSD's with a marginal 111 * increase in non-interruptible request latency. 112 */ 113 static uint64_t g_dev_del_max_sectors = 262144; 114 SYSCTL_DECL(_kern_geom); 115 SYSCTL_NODE(_kern_geom, OID_AUTO, dev, CTLFLAG_RW, 0, "GEOM_DEV stuff"); 116 SYSCTL_QUAD(_kern_geom_dev, OID_AUTO, delete_max_sectors, CTLFLAG_RW, 117 &g_dev_del_max_sectors, 0, "Maximum number of sectors in a single " 118 "delete request sent to the provider. Larger requests are chunked " 119 "so they can be interrupted. (0 = disable chunking)"); 120 121 static char *dumpdev = NULL; 122 static void 123 g_dev_init(struct g_class *mp) 124 { 125 126 dumpdev = kern_getenv("dumpdev"); 127 } 128 129 static void 130 g_dev_fini(struct g_class *mp) 131 { 132 133 freeenv(dumpdev); 134 dumpdev = NULL; 135 } 136 137 static int 138 g_dev_setdumpdev(struct cdev *dev, struct diocskerneldump_arg *kda) 139 { 140 struct g_kerneldump kd; 141 struct g_consumer *cp; 142 int error, len; 143 144 MPASS(dev != NULL && kda != NULL); 145 MPASS(kda->kda_index != KDA_REMOVE); 146 147 cp = dev->si_drv2; 148 len = sizeof(kd); 149 memset(&kd, 0, len); 150 kd.offset = 0; 151 kd.length = OFF_MAX; 152 error = g_io_getattr("GEOM::kerneldump", cp, &len, &kd); 153 if (error != 0) 154 return (error); 155 156 error = dumper_insert(&kd.di, devtoname(dev), kda); 157 if (error == 0) 158 dev->si_flags |= SI_DUMPDEV; 159 160 return (error); 161 } 162 163 static int 164 init_dumpdev(struct cdev *dev) 165 { 166 struct diocskerneldump_arg kda; 167 struct g_consumer *cp; 168 const char *devprefix = "/dev/", *devname; 169 int error; 170 size_t len; 171 172 bzero(&kda, sizeof(kda)); 173 kda.kda_index = KDA_APPEND; 174 175 if (dumpdev == NULL) 176 return (0); 177 178 len = strlen(devprefix); 179 devname = devtoname(dev); 180 if (strcmp(devname, dumpdev) != 0 && 181 (strncmp(dumpdev, devprefix, len) != 0 || 182 strcmp(devname, dumpdev + len) != 0)) 183 return (0); 184 185 cp = (struct g_consumer *)dev->si_drv2; 186 error = g_access(cp, 1, 0, 0); 187 if (error != 0) 188 return (error); 189 190 error = g_dev_setdumpdev(dev, &kda); 191 if (error == 0) { 192 freeenv(dumpdev); 193 dumpdev = NULL; 194 } 195 196 (void)g_access(cp, -1, 0, 0); 197 198 return (error); 199 } 200 201 static void 202 g_dev_destroy(void *arg, int flags __unused) 203 { 204 struct g_consumer *cp; 205 struct g_geom *gp; 206 struct g_dev_softc *sc; 207 char buf[SPECNAMELEN + 6]; 208 209 g_topology_assert(); 210 cp = arg; 211 gp = cp->geom; 212 sc = cp->private; 213 g_trace(G_T_TOPOLOGY, "g_dev_destroy(%p(%s))", cp, gp->name); 214 snprintf(buf, sizeof(buf), "cdev=%s", gp->name); 215 devctl_notify_f("GEOM", "DEV", "DESTROY", buf, M_WAITOK); 216 if (cp->acr > 0 || cp->acw > 0 || cp->ace > 0) 217 g_access(cp, -cp->acr, -cp->acw, -cp->ace); 218 g_detach(cp); 219 g_destroy_consumer(cp); 220 g_destroy_geom(gp); 221 mtx_destroy(&sc->sc_mtx); 222 g_free(sc); 223 } 224 225 void 226 g_dev_print(void) 227 { 228 struct g_geom *gp; 229 char const *p = ""; 230 231 LIST_FOREACH(gp, &g_dev_class.geom, geom) { 232 printf("%s%s", p, gp->name); 233 p = " "; 234 } 235 printf("\n"); 236 } 237 238 static void 239 g_dev_set_physpath(struct g_consumer *cp) 240 { 241 struct g_dev_softc *sc; 242 char *physpath; 243 int error, physpath_len; 244 245 if (g_access(cp, 1, 0, 0) != 0) 246 return; 247 248 sc = cp->private; 249 physpath_len = MAXPATHLEN; 250 physpath = g_malloc(physpath_len, M_WAITOK|M_ZERO); 251 error = g_io_getattr("GEOM::physpath", cp, &physpath_len, physpath); 252 g_access(cp, -1, 0, 0); 253 if (error == 0 && strlen(physpath) != 0) { 254 struct cdev *dev, *old_alias_dev; 255 struct cdev **alias_devp; 256 257 dev = sc->sc_dev; 258 old_alias_dev = sc->sc_alias; 259 alias_devp = (struct cdev **)&sc->sc_alias; 260 make_dev_physpath_alias(MAKEDEV_WAITOK, alias_devp, dev, 261 old_alias_dev, physpath); 262 } else if (sc->sc_alias) { 263 destroy_dev((struct cdev *)sc->sc_alias); 264 sc->sc_alias = NULL; 265 } 266 g_free(physpath); 267 } 268 269 static void 270 g_dev_set_media(struct g_consumer *cp) 271 { 272 struct g_dev_softc *sc; 273 struct cdev *dev; 274 char buf[SPECNAMELEN + 6]; 275 276 sc = cp->private; 277 dev = sc->sc_dev; 278 snprintf(buf, sizeof(buf), "cdev=%s", dev->si_name); 279 devctl_notify_f("DEVFS", "CDEV", "MEDIACHANGE", buf, M_WAITOK); 280 devctl_notify_f("GEOM", "DEV", "MEDIACHANGE", buf, M_WAITOK); 281 dev = sc->sc_alias; 282 if (dev != NULL) { 283 snprintf(buf, sizeof(buf), "cdev=%s", dev->si_name); 284 devctl_notify_f("DEVFS", "CDEV", "MEDIACHANGE", buf, M_WAITOK); 285 devctl_notify_f("GEOM", "DEV", "MEDIACHANGE", buf, M_WAITOK); 286 } 287 } 288 289 static void 290 g_dev_attrchanged(struct g_consumer *cp, const char *attr) 291 { 292 293 if (strcmp(attr, "GEOM::media") == 0) { 294 g_dev_set_media(cp); 295 return; 296 } 297 298 if (strcmp(attr, "GEOM::physpath") == 0) { 299 g_dev_set_physpath(cp); 300 return; 301 } 302 } 303 304 static void 305 g_dev_resize(struct g_consumer *cp) 306 { 307 char buf[SPECNAMELEN + 6]; 308 309 snprintf(buf, sizeof(buf), "cdev=%s", cp->provider->name); 310 devctl_notify_f("GEOM", "DEV", "SIZECHANGE", buf, M_WAITOK); 311 } 312 313 struct g_provider * 314 g_dev_getprovider(struct cdev *dev) 315 { 316 struct g_consumer *cp; 317 318 g_topology_assert(); 319 if (dev == NULL) 320 return (NULL); 321 if (dev->si_devsw != &g_dev_cdevsw) 322 return (NULL); 323 cp = dev->si_drv2; 324 return (cp->provider); 325 } 326 327 static struct g_geom * 328 g_dev_taste(struct g_class *mp, struct g_provider *pp, int insist __unused) 329 { 330 struct g_geom *gp; 331 struct g_geom_alias *gap; 332 struct g_consumer *cp; 333 struct g_dev_softc *sc; 334 int error; 335 struct cdev *dev, *adev; 336 char buf[SPECNAMELEN + 6]; 337 struct make_dev_args args; 338 339 g_trace(G_T_TOPOLOGY, "dev_taste(%s,%s)", mp->name, pp->name); 340 g_topology_assert(); 341 gp = g_new_geomf(mp, "%s", pp->name); 342 sc = g_malloc(sizeof(*sc), M_WAITOK | M_ZERO); 343 mtx_init(&sc->sc_mtx, "g_dev", NULL, MTX_DEF); 344 cp = g_new_consumer(gp); 345 cp->private = sc; 346 cp->flags |= G_CF_DIRECT_SEND | G_CF_DIRECT_RECEIVE; 347 error = g_attach(cp, pp); 348 KASSERT(error == 0, 349 ("g_dev_taste(%s) failed to g_attach, err=%d", pp->name, error)); 350 351 make_dev_args_init(&args); 352 args.mda_flags = MAKEDEV_CHECKNAME | MAKEDEV_WAITOK; 353 args.mda_devsw = &g_dev_cdevsw; 354 args.mda_cr = NULL; 355 args.mda_uid = UID_ROOT; 356 args.mda_gid = GID_OPERATOR; 357 args.mda_mode = 0640; 358 args.mda_si_drv1 = sc; 359 args.mda_si_drv2 = cp; 360 error = make_dev_s(&args, &sc->sc_dev, "%s", gp->name); 361 if (error != 0) { 362 printf("%s: make_dev_p() failed (gp->name=%s, error=%d)\n", 363 __func__, gp->name, error); 364 g_detach(cp); 365 g_destroy_consumer(cp); 366 g_destroy_geom(gp); 367 mtx_destroy(&sc->sc_mtx); 368 g_free(sc); 369 return (NULL); 370 } 371 dev = sc->sc_dev; 372 dev->si_flags |= SI_UNMAPPED; 373 dev->si_iosize_max = MAXPHYS; 374 error = init_dumpdev(dev); 375 if (error != 0) 376 printf("%s: init_dumpdev() failed (gp->name=%s, error=%d)\n", 377 __func__, gp->name, error); 378 379 g_dev_attrchanged(cp, "GEOM::physpath"); 380 snprintf(buf, sizeof(buf), "cdev=%s", gp->name); 381 devctl_notify_f("GEOM", "DEV", "CREATE", buf, M_WAITOK); 382 /* 383 * Now add all the aliases for this drive 384 */ 385 LIST_FOREACH(gap, &pp->geom->aliases, ga_next) { 386 error = make_dev_alias_p(MAKEDEV_CHECKNAME | MAKEDEV_WAITOK, &adev, dev, 387 "%s", gap->ga_alias); 388 if (error) { 389 printf("%s: make_dev_alias_p() failed (name=%s, error=%d)\n", 390 __func__, gap->ga_alias, error); 391 continue; 392 } 393 snprintf(buf, sizeof(buf), "cdev=%s", gap->ga_alias); 394 devctl_notify_f("GEOM", "DEV", "CREATE", buf, M_WAITOK); 395 } 396 397 return (gp); 398 } 399 400 static int 401 g_dev_open(struct cdev *dev, int flags, int fmt, struct thread *td) 402 { 403 struct g_consumer *cp; 404 struct g_dev_softc *sc; 405 int error, r, w, e; 406 407 cp = dev->si_drv2; 408 g_trace(G_T_ACCESS, "g_dev_open(%s, %d, %d, %p)", 409 cp->geom->name, flags, fmt, td); 410 411 r = flags & FREAD ? 1 : 0; 412 w = flags & FWRITE ? 1 : 0; 413 #ifdef notyet 414 e = flags & O_EXCL ? 1 : 0; 415 #else 416 e = 0; 417 #endif 418 419 /* 420 * This happens on attempt to open a device node with O_EXEC. 421 */ 422 if (r + w + e == 0) 423 return (EINVAL); 424 425 if (w) { 426 /* 427 * When running in very secure mode, do not allow 428 * opens for writing of any disks. 429 */ 430 error = securelevel_ge(td->td_ucred, 2); 431 if (error) 432 return (error); 433 } 434 g_topology_lock(); 435 error = g_access(cp, r, w, e); 436 g_topology_unlock(); 437 if (error == 0) { 438 sc = dev->si_drv1; 439 mtx_lock(&sc->sc_mtx); 440 if (sc->sc_open == 0 && (sc->sc_active & SC_A_ACTIVE) != 0) 441 wakeup(&sc->sc_active); 442 sc->sc_open += r + w + e; 443 if (sc->sc_open == 0) 444 atomic_clear_int(&sc->sc_active, SC_A_OPEN); 445 else 446 atomic_set_int(&sc->sc_active, SC_A_OPEN); 447 mtx_unlock(&sc->sc_mtx); 448 } 449 return (error); 450 } 451 452 static int 453 g_dev_close(struct cdev *dev, int flags, int fmt, struct thread *td) 454 { 455 struct g_consumer *cp; 456 struct g_dev_softc *sc; 457 int error, r, w, e; 458 459 cp = dev->si_drv2; 460 g_trace(G_T_ACCESS, "g_dev_close(%s, %d, %d, %p)", 461 cp->geom->name, flags, fmt, td); 462 463 r = flags & FREAD ? -1 : 0; 464 w = flags & FWRITE ? -1 : 0; 465 #ifdef notyet 466 e = flags & O_EXCL ? -1 : 0; 467 #else 468 e = 0; 469 #endif 470 471 /* 472 * The vgonel(9) - caused by eg. forced unmount of devfs - calls 473 * VOP_CLOSE(9) on devfs vnode without any FREAD or FWRITE flags, 474 * which would result in zero deltas, which in turn would cause 475 * panic in g_access(9). 476 * 477 * Note that we cannot zero the counters (ie. do "r = cp->acr" 478 * etc) instead, because the consumer might be opened in another 479 * devfs instance. 480 */ 481 if (r + w + e == 0) 482 return (EINVAL); 483 484 sc = dev->si_drv1; 485 mtx_lock(&sc->sc_mtx); 486 sc->sc_open += r + w + e; 487 if (sc->sc_open == 0) 488 atomic_clear_int(&sc->sc_active, SC_A_OPEN); 489 else 490 atomic_set_int(&sc->sc_active, SC_A_OPEN); 491 while (sc->sc_open == 0 && (sc->sc_active & SC_A_ACTIVE) != 0) 492 msleep(&sc->sc_active, &sc->sc_mtx, 0, "g_dev_close", hz / 10); 493 mtx_unlock(&sc->sc_mtx); 494 g_topology_lock(); 495 error = g_access(cp, r, w, e); 496 g_topology_unlock(); 497 return (error); 498 } 499 500 /* 501 * XXX: Until we have unmessed the ioctl situation, there is a race against 502 * XXX: a concurrent orphanization. We cannot close it by holding topology 503 * XXX: since that would prevent us from doing our job, and stalling events 504 * XXX: will break (actually: stall) the BSD disklabel hacks. 505 */ 506 static int 507 g_dev_ioctl(struct cdev *dev, u_long cmd, caddr_t data, int fflag, struct thread *td) 508 { 509 struct g_consumer *cp; 510 struct g_provider *pp; 511 off_t offset, length, chunk, odd; 512 int i, error; 513 #ifdef COMPAT_FREEBSD12 514 struct diocskerneldump_arg kda_copy; 515 #endif 516 517 cp = dev->si_drv2; 518 pp = cp->provider; 519 520 error = 0; 521 KASSERT(cp->acr || cp->acw, 522 ("Consumer with zero access count in g_dev_ioctl")); 523 524 i = IOCPARM_LEN(cmd); 525 switch (cmd) { 526 case DIOCGSECTORSIZE: 527 *(u_int *)data = cp->provider->sectorsize; 528 if (*(u_int *)data == 0) 529 error = ENOENT; 530 break; 531 case DIOCGMEDIASIZE: 532 *(off_t *)data = cp->provider->mediasize; 533 if (*(off_t *)data == 0) 534 error = ENOENT; 535 break; 536 case DIOCGFWSECTORS: 537 error = g_io_getattr("GEOM::fwsectors", cp, &i, data); 538 if (error == 0 && *(u_int *)data == 0) 539 error = ENOENT; 540 break; 541 case DIOCGFWHEADS: 542 error = g_io_getattr("GEOM::fwheads", cp, &i, data); 543 if (error == 0 && *(u_int *)data == 0) 544 error = ENOENT; 545 break; 546 case DIOCGFRONTSTUFF: 547 error = g_io_getattr("GEOM::frontstuff", cp, &i, data); 548 break; 549 #ifdef COMPAT_FREEBSD11 550 case DIOCSKERNELDUMP_FREEBSD11: 551 { 552 struct diocskerneldump_arg kda; 553 554 gone_in(13, "FreeBSD 11.x ABI compat"); 555 556 bzero(&kda, sizeof(kda)); 557 kda.kda_encryption = KERNELDUMP_ENC_NONE; 558 kda.kda_index = (*(u_int *)data ? 0 : KDA_REMOVE_ALL); 559 if (kda.kda_index == KDA_REMOVE_ALL) 560 error = dumper_remove(devtoname(dev), &kda); 561 else 562 error = g_dev_setdumpdev(dev, &kda); 563 break; 564 } 565 #endif 566 #ifdef COMPAT_FREEBSD12 567 case DIOCSKERNELDUMP_FREEBSD12: 568 { 569 struct diocskerneldump_arg_freebsd12 *kda12; 570 571 gone_in(14, "FreeBSD 12.x ABI compat"); 572 573 kda12 = (void *)data; 574 memcpy(&kda_copy, kda12, sizeof(kda_copy)); 575 kda_copy.kda_index = (kda12->kda12_enable ? 576 0 : KDA_REMOVE_ALL); 577 578 explicit_bzero(kda12, sizeof(*kda12)); 579 /* Kludge to pass kda_copy to kda in fallthrough. */ 580 data = (void *)&kda_copy; 581 } 582 /* FALLTHROUGH */ 583 #endif 584 case DIOCSKERNELDUMP: 585 { 586 struct diocskerneldump_arg *kda; 587 uint8_t *encryptedkey; 588 589 kda = (struct diocskerneldump_arg *)data; 590 if (kda->kda_index == KDA_REMOVE_ALL || 591 kda->kda_index == KDA_REMOVE_DEV || 592 kda->kda_index == KDA_REMOVE) { 593 error = dumper_remove(devtoname(dev), kda); 594 explicit_bzero(kda, sizeof(*kda)); 595 break; 596 } 597 598 if (kda->kda_encryption != KERNELDUMP_ENC_NONE) { 599 if (kda->kda_encryptedkeysize == 0 || 600 kda->kda_encryptedkeysize > 601 KERNELDUMP_ENCKEY_MAX_SIZE) { 602 explicit_bzero(kda, sizeof(*kda)); 603 return (EINVAL); 604 } 605 encryptedkey = malloc(kda->kda_encryptedkeysize, M_TEMP, 606 M_WAITOK); 607 error = copyin(kda->kda_encryptedkey, encryptedkey, 608 kda->kda_encryptedkeysize); 609 } else { 610 encryptedkey = NULL; 611 } 612 if (error == 0) { 613 kda->kda_encryptedkey = encryptedkey; 614 error = g_dev_setdumpdev(dev, kda); 615 } 616 if (encryptedkey != NULL) { 617 explicit_bzero(encryptedkey, kda->kda_encryptedkeysize); 618 free(encryptedkey, M_TEMP); 619 } 620 explicit_bzero(kda, sizeof(*kda)); 621 break; 622 } 623 case DIOCGFLUSH: 624 error = g_io_flush(cp); 625 break; 626 case DIOCGDELETE: 627 offset = ((off_t *)data)[0]; 628 length = ((off_t *)data)[1]; 629 if ((offset % cp->provider->sectorsize) != 0 || 630 (length % cp->provider->sectorsize) != 0 || length <= 0) { 631 printf("%s: offset=%jd length=%jd\n", __func__, offset, 632 length); 633 error = EINVAL; 634 break; 635 } 636 if ((cp->provider->mediasize > 0) && 637 (offset >= cp->provider->mediasize)) { 638 /* 639 * Catch out-of-bounds requests here. The problem is 640 * that due to historical GEOM I/O implementation 641 * peculatities, g_delete_data() would always return 642 * success for requests starting just the next byte 643 * after providers media boundary. Condition check on 644 * non-zero media size, since that condition would 645 * (most likely) cause ENXIO instead. 646 */ 647 error = EIO; 648 break; 649 } 650 while (length > 0) { 651 chunk = length; 652 if (g_dev_del_max_sectors != 0 && chunk > 653 g_dev_del_max_sectors * cp->provider->sectorsize) { 654 chunk = g_dev_del_max_sectors * 655 cp->provider->sectorsize; 656 if (cp->provider->stripesize > 0) { 657 odd = (offset + chunk + 658 cp->provider->stripeoffset) % 659 cp->provider->stripesize; 660 if (chunk > odd) 661 chunk -= odd; 662 } 663 } 664 error = g_delete_data(cp, offset, chunk); 665 length -= chunk; 666 offset += chunk; 667 if (error) 668 break; 669 /* 670 * Since the request size can be large, the service 671 * time can be is likewise. We make this ioctl 672 * interruptible by checking for signals for each bio. 673 */ 674 if (SIGPENDING(td)) 675 break; 676 } 677 break; 678 case DIOCGIDENT: 679 error = g_io_getattr("GEOM::ident", cp, &i, data); 680 break; 681 case DIOCGPROVIDERNAME: 682 if (pp == NULL) 683 return (ENOENT); 684 strlcpy(data, pp->name, i); 685 break; 686 case DIOCGSTRIPESIZE: 687 *(off_t *)data = cp->provider->stripesize; 688 break; 689 case DIOCGSTRIPEOFFSET: 690 *(off_t *)data = cp->provider->stripeoffset; 691 break; 692 case DIOCGPHYSPATH: 693 error = g_io_getattr("GEOM::physpath", cp, &i, data); 694 if (error == 0 && *(char *)data == '\0') 695 error = ENOENT; 696 break; 697 case DIOCGATTR: { 698 struct diocgattr_arg *arg = (struct diocgattr_arg *)data; 699 700 if (arg->len > sizeof(arg->value)) { 701 error = EINVAL; 702 break; 703 } 704 error = g_io_getattr(arg->name, cp, &arg->len, &arg->value); 705 break; 706 } 707 case DIOCZONECMD: { 708 struct disk_zone_args *zone_args =(struct disk_zone_args *)data; 709 struct disk_zone_rep_entry *new_entries, *old_entries; 710 struct disk_zone_report *rep; 711 size_t alloc_size; 712 713 old_entries = NULL; 714 new_entries = NULL; 715 rep = NULL; 716 alloc_size = 0; 717 718 if (zone_args->zone_cmd == DISK_ZONE_REPORT_ZONES) { 719 rep = &zone_args->zone_params.report; 720 #define MAXENTRIES (MAXPHYS / sizeof(struct disk_zone_rep_entry)) 721 if (rep->entries_allocated > MAXENTRIES) 722 rep->entries_allocated = MAXENTRIES; 723 alloc_size = rep->entries_allocated * 724 sizeof(struct disk_zone_rep_entry); 725 if (alloc_size != 0) 726 new_entries = g_malloc(alloc_size, 727 M_WAITOK| M_ZERO); 728 old_entries = rep->entries; 729 rep->entries = new_entries; 730 } 731 error = g_io_zonecmd(zone_args, cp); 732 if (zone_args->zone_cmd == DISK_ZONE_REPORT_ZONES && 733 alloc_size != 0 && error == 0) 734 error = copyout(new_entries, old_entries, alloc_size); 735 if (old_entries != NULL && rep != NULL) 736 rep->entries = old_entries; 737 if (new_entries != NULL) 738 g_free(new_entries); 739 break; 740 } 741 default: 742 if (cp->provider->geom->ioctl != NULL) { 743 error = cp->provider->geom->ioctl(cp->provider, cmd, data, fflag, td); 744 } else { 745 error = ENOIOCTL; 746 } 747 } 748 749 return (error); 750 } 751 752 static void 753 g_dev_done(struct bio *bp2) 754 { 755 struct g_consumer *cp; 756 struct g_dev_softc *sc; 757 struct bio *bp; 758 int active; 759 760 cp = bp2->bio_from; 761 sc = cp->private; 762 bp = bp2->bio_parent; 763 bp->bio_error = bp2->bio_error; 764 bp->bio_completed = bp2->bio_completed; 765 bp->bio_resid = bp->bio_length - bp2->bio_completed; 766 if (bp2->bio_cmd == BIO_ZONE) 767 bcopy(&bp2->bio_zone, &bp->bio_zone, sizeof(bp->bio_zone)); 768 769 if (bp2->bio_error != 0) { 770 g_trace(G_T_BIO, "g_dev_done(%p) had error %d", 771 bp2, bp2->bio_error); 772 bp->bio_flags |= BIO_ERROR; 773 } else { 774 g_trace(G_T_BIO, "g_dev_done(%p/%p) resid %ld completed %jd", 775 bp2, bp, bp2->bio_resid, (intmax_t)bp2->bio_completed); 776 } 777 g_destroy_bio(bp2); 778 active = atomic_fetchadd_int(&sc->sc_active, -1) - 1; 779 if ((active & SC_A_ACTIVE) == 0) { 780 if ((active & SC_A_OPEN) == 0) 781 wakeup(&sc->sc_active); 782 if (active & SC_A_DESTROY) 783 g_post_event(g_dev_destroy, cp, M_NOWAIT, NULL); 784 } 785 biodone(bp); 786 } 787 788 static void 789 g_dev_strategy(struct bio *bp) 790 { 791 struct g_consumer *cp; 792 struct bio *bp2; 793 struct cdev *dev; 794 struct g_dev_softc *sc; 795 796 KASSERT(bp->bio_cmd == BIO_READ || 797 bp->bio_cmd == BIO_WRITE || 798 bp->bio_cmd == BIO_DELETE || 799 bp->bio_cmd == BIO_FLUSH || 800 bp->bio_cmd == BIO_ZONE, 801 ("Wrong bio_cmd bio=%p cmd=%d", bp, bp->bio_cmd)); 802 dev = bp->bio_dev; 803 cp = dev->si_drv2; 804 KASSERT(cp->acr || cp->acw, 805 ("Consumer with zero access count in g_dev_strategy")); 806 biotrack(bp, __func__); 807 #ifdef INVARIANTS 808 if ((bp->bio_offset % cp->provider->sectorsize) != 0 || 809 (bp->bio_bcount % cp->provider->sectorsize) != 0) { 810 bp->bio_resid = bp->bio_bcount; 811 biofinish(bp, NULL, EINVAL); 812 return; 813 } 814 #endif 815 sc = dev->si_drv1; 816 KASSERT(sc->sc_open > 0, ("Closed device in g_dev_strategy")); 817 atomic_add_int(&sc->sc_active, 1); 818 819 for (;;) { 820 /* 821 * XXX: This is not an ideal solution, but I believe it to 822 * XXX: deadlock safely, all things considered. 823 */ 824 bp2 = g_clone_bio(bp); 825 if (bp2 != NULL) 826 break; 827 pause("gdstrat", hz / 10); 828 } 829 KASSERT(bp2 != NULL, ("XXX: ENOMEM in a bad place")); 830 bp2->bio_done = g_dev_done; 831 g_trace(G_T_BIO, 832 "g_dev_strategy(%p/%p) offset %jd length %jd data %p cmd %d", 833 bp, bp2, (intmax_t)bp->bio_offset, (intmax_t)bp2->bio_length, 834 bp2->bio_data, bp2->bio_cmd); 835 g_io_request(bp2, cp); 836 KASSERT(cp->acr || cp->acw, 837 ("g_dev_strategy raced with g_dev_close and lost")); 838 839 } 840 841 /* 842 * g_dev_callback() 843 * 844 * Called by devfs when asynchronous device destruction is completed. 845 * - Mark that we have no attached device any more. 846 * - If there are no outstanding requests, schedule geom destruction. 847 * Otherwise destruction will be scheduled later by g_dev_done(). 848 */ 849 850 static void 851 g_dev_callback(void *arg) 852 { 853 struct g_consumer *cp; 854 struct g_dev_softc *sc; 855 int active; 856 857 cp = arg; 858 sc = cp->private; 859 g_trace(G_T_TOPOLOGY, "g_dev_callback(%p(%s))", cp, cp->geom->name); 860 861 sc->sc_dev = NULL; 862 sc->sc_alias = NULL; 863 active = atomic_fetchadd_int(&sc->sc_active, SC_A_DESTROY); 864 if ((active & SC_A_ACTIVE) == 0) 865 g_post_event(g_dev_destroy, cp, M_WAITOK, NULL); 866 } 867 868 /* 869 * g_dev_orphan() 870 * 871 * Called from below when the provider orphaned us. 872 * - Clear any dump settings. 873 * - Request asynchronous device destruction to prevent any more requests 874 * from coming in. The provider is already marked with an error, so 875 * anything which comes in the interim will be returned immediately. 876 */ 877 878 static void 879 g_dev_orphan(struct g_consumer *cp) 880 { 881 struct cdev *dev; 882 struct g_dev_softc *sc; 883 884 g_topology_assert(); 885 sc = cp->private; 886 dev = sc->sc_dev; 887 g_trace(G_T_TOPOLOGY, "g_dev_orphan(%p(%s))", cp, cp->geom->name); 888 889 /* Reset any dump-area set on this device */ 890 if (dev->si_flags & SI_DUMPDEV) { 891 struct diocskerneldump_arg kda; 892 893 bzero(&kda, sizeof(kda)); 894 kda.kda_index = KDA_REMOVE_DEV; 895 (void)dumper_remove(devtoname(dev), &kda); 896 } 897 898 /* Destroy the struct cdev *so we get no more requests */ 899 delist_dev(dev); 900 destroy_dev_sched_cb(dev, g_dev_callback, cp); 901 } 902 903 DECLARE_GEOM_CLASS(g_dev_class, g_dev); 904